Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edc6b75b87d8d8f…

MALICIOUS

PDF

89.8 KB Created: 2021-08-09 03:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3ab29e3909147dd5c97cfff783e6dceb SHA-1: e1f1e546b8d80ac8492a26db757229de14f8424c SHA-256: 9edc6b75b87d8d8f0b0ef410915f0be256a41e8dcc1c11f48b18de93ea3d8086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=anno+1800+mods+installieren+deutsch PDF link annotation
    • https://krono-original.vn/Images_upload/files/15198163654.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160960decf33ad---15090599845.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vovisisepupuxade.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/logijuriwavar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f96049850---25658906282.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f73a4c43---sazenopifigabijimet.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f6068707f0085e3d00d9ad467ca3608d/65074887479.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/mowesov.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fixebora.pdfIn PDF document text
    • https://activepymes.com/pub/file/73348666762.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/46064775850.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/12938044969.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/44631297226.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/nufuruse.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f5e77a3f---58610445960.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/bofavofitabop.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/58605070025.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ac0062fb1---tapupuvokobokisofavono.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/jewuj.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/79103176374.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f872da134---55176264883.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/xisivowenisomapilukudi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3841c42a3---dupatub.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 11100 bytes
SHA-256: e1b78eca97fb48d6cd426af129a30dc39039f0f7ebb10b688bf21763188a1154
font_01_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 19572 bytes
SHA-256: 3fdb9b2bbac4e3d27e1ea075864edaa4be1769aa1ed297e254098d02759c0a6c
font_02_sfnt_off00013feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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